Generating a dynamic switched major node name

To use the multiple dynamic switched major nodes function, the exit routine should include a procedure that will generate a new major node name for the switched resource, set the appropriate bit in the build vector, along with the other necessary information, and return the build vector to VTAM®.

Consider the following information when generating a major node name:

The procedure should determine whether a new major node name will be generated or whether an existing name will be used for the dynamic resources that are being created.
This is the part of the procedure that enables you to group several switched resources under a specific major node. You will have to code whatever algorithm is necessary to determine when to create a new major node name or use an existing one.
If a new major node name is being generated:
- The name must be in the range 1–8 characters
- The first 3 characters must not be IST
- The first character must be alphabetic or national, and the remaining characters must be alphabetic, numeric, or national.
If the exit returns the name of a major node that already exists:
- The major node cannot be an application major node
- The major node must be a dynamic switched major node
- The dynamic switched major node must be active
Note: If the exit does not return a major node name, VTAM uses ISTDSWMN as the default name.